<!DOCTYPE html>
<html lang="zh">
  <head>
    <meta charset="utf-8" />
    <link rel="stylesheet" href="style.css" />
    <title>圆形金属质感按钮</title>
    <style type="text/css">
      .app {
        width: 100%;
        height: 100vh;
        background-color: #ffffff;
        position: relative;
        display: flex;
        justify-content: center;
        align-items: center;
      }
      .btn76 {
        width: 64px;
        height: 64px;
        background: conic-gradient(
          from 180deg at 50% 50%,
          rgba(0, 0, 0, 0.4) 0deg,
          #ffffff 90deg,
          rgba(0, 0, 0, 0.4) 181deg,
          #ffffff 270deg,
          rgba(0, 0, 0, 0.4) 360deg
        );
        border-radius: 50%;
        border: 1px solid rgba(0, 0, 0, 0.2);
        box-shadow: 1px 1px 0 rgba(255, 255, 255, 0.4) inset,
          -1px -1px 0 rgba(255, 255, 255, 0.2) inset;
        outline: 1px dashed rgba(0, 0, 0, 0.2);
        outline-offset: -6px;
        cursor: pointer;
        position: relative;
        box-sizing: border-box;
      }
      .inp76 {
        width: 6px;
        height: 6px;
        background-color: rgba(255, 255, 255, 0.6);
        border-radius: 50%;
        position: absolute;
        left: 24px;
        top: 5px;
        appearance: none;
        z-index: 10;
      }
      .btn76:active {
        transform: scale(0.98);
      }
      .inp76:checked {
        background: #0dff00;
        box-shadow: 0px 0px 4px 2px rgba(78, 229, 70, 0.4);
      }
    </style>
  </head>
  <body>
    <div class="app">
      <label class="btn76">
        <input type="checkbox" class="inp76" />
      </label>
    </div>
  </body>
</html>
